The valve should be used together with impulse valve. It's applicable while working below 540º C in boiler of power stations. When the steam pressure inside the boiler exceeds the permissible values, pressure signal sent from impulse valve initiates the main valve followed by full discharge of pressure. In the event of the pressure inside the equipment and conduit surpassing allowable value, the valve automatically opens, which is followed by full discharge. While the pressure drops to normal parameters, the valve automatically closes to ensure safe operation of equipment and conduit.